Vibrator for molds and dental flasks



May 19, 1931. E. amass VIBRATOR FOR MOLDS AND DENTAL FLASKS Filed Nov. 15. 1929 w R s 9 We rm 0 2 ID A m W 5 1 M B J 2 1 I L 3 I Patented May 19, 1931 UNITED STATES PATENT OFFICE EDWARD BRIGGS, OF SAN FRANCISCO, CALIFORNIA, ASSIG-NOR '10 WILLIAM J. MORAN,

OF FAIRFAX,

CALIFORNIA VIBRATOR roR MOLIDS Ann DENTAL rnAsKs Application filed November 13, 1929. Serial No. 406,973.

My present invention relates to'a vibrating apparatus and more particularly to a vibrating apparatus of. the type used by dentists and jewelers for tamping and packing small 5 molds and flasks.

7 ceeds. 1

Forabetter; understanding of my invention, reference should be had to the accompanying drawings, wherein I have shown by way of illustration and not of limitation,

two preferred types of apparatus which embody the invention.

In the drawings- .Fig. 1.:is a side elevation, partially in section, showing the internal construction of one type of apparatus, and V v Fig. 2 is a view similar to Fig. 1 showing a modified form of, theapparatus.

In the figures of the drawings like numerals refer to like parts throughout.

, In the drawings 10 designates asuitable housing which in the present instance IS'PI'O- vided with an open bottom adapted to be closed by. a suitable plate The plate 11 is provided with suitable bosses 12, upon WhlCll there may or may not be mounted rubber or other yielding pads 13; In Fig. 1,-secured to one side of the housing10 by means of a 15 is L-shaped and mounted thereupon there is a'laminated core structure 16. The core structure 16, it will be understood, is riveted at various points, principally near the ends,

for the purpose of maintaining the 'laminations as a unitary structure. The core member 16 has an upwardly extending pole piece 17, about which there is disposed a suitable energizing coil 18,.the coil 18 being supplied with current through a lead 19. The core 16 is so formed that its other end, designated by the numeral 20, overhangs the pole piece 17 in a position slightly displaced therefrom. With this arrangement, it will be understood that when, alternating current is impressed upon the coil 18, the pole portion 20 of, the core 16 will be caused to vibrate in response to the rise and fall of magnetism induced in the core 16 as the current in the power source alternates. Extending upwardly from the pole piece 20, I provide a suitable support 21 which projects through an opening 22in the top of the housing 10 and uponthe upper end of the support'21 there is disposed a plate or table member 23, upon which the work to be vibrated may be placed. The table 23 is shown as disposed at a slight angle. This disposition of the table 23 is such that when the vibrating apparatus is operating under its normal load, the table will be disposed in an approximately level position. In this embodiment of my invention it will'be noted that the table 23 may be said to be hinged at a point to one side of its central portion so that as it vibrates it will move in an arcuate path rather than with a strict" reciprocating movement.

The embodiment of my invention illustrated in Fig. 2, while possessing many of the features set forth in connection with the embodiment illustrated in Fig. 1, has certain other differences in construction which make it particularly well suited to work of a heavier nature. In this embodiment of my invention, I show a core portion 24 which is in some respects similar to the standard shell type of transformercore, it being in two halves which are riveted together to form a V central pole-25 about which the coil 17 is screw 14, I show a bracket 15. The bracket disposed. The opposite ends of the core 24 are turned about upon each other and are dis posed so as to provide oppositely disposed pole pieces 26 and 27. The pole pieces 26 and 27 are, in vturn, secured to the casing 10 by means of screws. 28, so that they are fixed and the central pole piece 25 of the core 24 is disposed midway between the poles 26 and 27 and slightly therebelow so that when the coil 17 is energized, the pole piece 25 will be drawn upwardly and vibrated, as previously suggested, due to the alternations of energizing current when the coil 17 is. connected to a suitable source of alternatingcurrent. The support 21 is "shown as projecting up wardly out of the end of the pole and it, in turn, carries a suitable table or plate member 29. The plate member 29 in this embodi ment, it will be understood, will have a strict up and down movement, the support 21 therefor passing through an opening inthe top of the housing 10. In order to support the coil 17 within the housing 10 about the pole piece 25, I provide suitable brackets 31 ivhie'h :project from the side walls "of the housing 10 and immediately -thereabove I Wedge in an insulating member 32, which maintains the coils 17 firmly about the central pole piece 25. As the pole piece25 is vibrated, it will be understood that the core 24, because of its laminated constructiomwill freely yield intermediate its ends, so .as to permit the necessary vibration.

It is believed that the operation of my im- ;proved apparatus will be readily apparent to those skilled in the art; however, in connection with the modification shown in Fig.

l, I desire to point out that, because of the disposition of the plate or table 23 to one side of the hinging portion of the core 1.6, I have provided a feature which has been'found ,veryacceptable in the trade. This feature is in the fact that the table 23, by reason of its disposition, as described, has different ranges of movement at itstwo extreme edges. In otherwords, at the edge designatedby .the numeral 33, the movement will be .con-

siderably less-than is the case at the point 34. In fact, it maybe saidthat at the point 34c,the movement ofthetable is substantially .up and .down; whereas, at the point 33, the

.movement of the table approaches a substantially horizontal movement with a slight vertical component. In taking advantage of this feature, the operator can, where he wishes to violently vibrate a flask, place it on the outer edge 34 of the table 23 and, where he desires a less violent vibration,'he may slide the flask or mold toward the edge 33 where, as stated above, the vibration or range of movement is considerably less.

While Ihave, forthe sake of clearness and in order to disclose my invention so that the same can be readily understood, descrlbed and illustrated specific devices and arrangements, I desire to have it understood that this invention is not limited tothe specific means disclosed but maybe embodied in otherways that will suggest themselves, in view of this broad disclosure, to persons skilled in the art. It is believed that this invention is broadly new and it is desired to claim it as such-so that all such changes as come within the scope of the appended claims areto be.

considered as part of this invention.

Having thus described my invention,-what I claim and desire to secure by Letters Patent is 1. A device for vibrating flasks and the like which comprises a yielding magnetic of said laminated core, and a work support mounted upon the other end of said laminated core whereby when the core is energized with alternating current said table will be vibrated.

3. An electric vibratorcomprising a relatively flexible laminated core, asupport for rigidly holding oneend of said core immovable, lthe otherend of said core being free and disposed opposite theimmovable end,.a n

energlzing winding disposed upon said im movable end of said core, and a worksupport attached to thefree end of said core and adapted to vibrate therewith when said windingis energized by a suitable source of current. r

4. An electric vibrator comprising acore having a flexibleend, a support for rigidly holding the othernend of, said core immovable, a single energizing winding disposed upon said immovable end of said core, and a work support attached to the fleXibleendof sa d core adap ed t brat with aid end when said winding 1s energized by a suitable source of current.

relatively flexible core disposed. within said housing and having one of-jits ends secured against movement, a single energizing winding disposed about the immovable end of said core,-and a work supporting table carried by the other and movable end of said core, said core. being so constructed that when said winding is energized by a suitable source of current, said free end of said core 'and said table will vibrate any .work placed upon said table.

i 6. In a vibratorfior dental work and the like, the combination of a relatively flexible eore having one of its ends secured ag nst movem t, M ng e gizing W n ng d p bo t th mm ablee d of sa d core, and a work supporting table carried by .the other and ,movable endof said .core, said core beingso constructed that when said winding is energized by ,a suitable source of current, said :tree,endflof said core and said a gie w l vib at ny -YQI-k pla e alp ai ta e.

. 7100 5. A vibrator for dental work and the'jlike mpr sing t e mbina on Qfa h u ng,

r tc mp ising'a ea ng, 'lam- 'inated flexible core within said casing and supported thereby, ,said core being bent around so that the two endsareadjacent each other, a ene gi ing oi sur oun ngn end of said core, and a work support attached to the other end of said core. 8. A vibrator comprising a casing, a laminated flexible core Within said casing and supported thereby, said core being bent around so that the two ends are adjacent each other, an energizing coil Within said casing and surrounding one end of said core, an opening in said casing, a rod extending in through said opening and attached to the other end of said core, and a Work supporting table outside of said casing attached to said rod.

EDWARD BRIGGS. 

